Gage, Alfred P. (Alfred Payson), 1836-1903 · Boston, London, Ginn · leaf 351
plane front of one of the waves. As soon as thewave reaches A, that point becomes the origin of a disturbance inthe ether, which spreads out in the form of a sphere having itscenter at A. This disturbance may for convenience be called anundulation. Let the arc of a circle described around A as a… … over KA, because so long as light travels in the same isotropicmedium its speed in all directions is the same. Similarly let circlesbe described around points B, C, and X> with radii determined inthe same manner. A straight line aftcD, drawn tangent to thesecircles at the points a, b, etc.,…
Physics
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